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Employee Benefit Plans - Pre-tax Net Changes in Projected Benefit Obligations Recognized in Other Comprehensive Income (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total recognized in other comprehensive income (loss) | $ (15) | $ (37) | $ (14)
Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial loss arising during the year | 7 | 15 |
Amortization of loss included in net periodic benefit cost | (2) | (1) | (1)
Recognition of loss due to curtailment | (5) | 0 |
Recognition of loss due to settlement | (2) | 0 |
Foreign currency exchange | 3 | 0 |
Total recognized in other comprehensive income (loss) | 1 | 14 |
Postemployment |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Actuarial loss arising during the year | 15 | 21 |
Amortization of loss included in net periodic benefit cost | (7) | (5) | $ (4)
Recognition of loss due to curtailment | 0 | 0 |
Recognition of loss due to settlement | 0 | 0 |
Foreign currency exchange | 0 | 0 |
Total recognized in other comprehensive income (loss) | $ 8 | $ 16 |

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